Apparatus for grading material



March 26, 1929. F. L. WAR-D 1,706,428

APPARATUS FOR GRADING MATERIAL 7 Filed Aug. 8, 192'? 3 sheets-shet 1 ahvento'v March 26, 1929. F. L. WARD APPARATUS FOR GRADING MATERIAL Filed 1927 3 Sheets-Sheet 2 March 26, 1929. F. WARD APPARATUS --FOR GRADING MATERIAL Fil'ed Aug. 8, 192? 5 Sheets-Sheet 3 56161764 /vrd UNITED STATES Patented Mar. 26, 1929.

PATENT. OFFICE.

FREDERIC L. WARD, F OXFORD, MICHIGAN.

APPARATUS son GRADING MATERiAL.

Application filed August 8, 1927. Serial: No. 211,558.

This invention" relates to apparatus for grading material and more particularly 'to.

a traveling grizzly screen for separating sand and gravel.

, The invention has as one ofits objects to provide acontinuously operating sand and gravel separating machine of a construction wherein the materials can be elevated and screened at one operation. 'This apparatus finds particular utility inhydraulic excavat,

its surface.

The invention further contemplates the provision of mechanical means for vibrating the screen without the use of additional power. v

The invention also contemplates numerous novel details of construction andhas also as its objects to simplify, render more efiicient and improve generally apparatus of this character. p u

The above objects and novel details ofconstruction of the invention will be nade more apparent as this cially whenconsidered in connection with the accompanying drawings wherein- V Figure 1 is a side elevation of the machine embodying my invention; Figure 2 is a plan view thereof; I

Figure 3 is an end elevation thereofyand Figure 4 is a detailed perspective view of the screen cloth and the connection thereof with the chain shafts. v 7

Referring now more particularly .to' the drawings wherein like reference characters indicatelike parts, it will be noted that there is illustrated a frame 10 inclined withinthe angle of friction and bent upwardly inter mediatethe ends thereof forming a platform ortable 11 constituting a support for the upper'tracks 12. Depending from and extending substantially parallel to. the frame 10 is a second frame 13secured. at the opposite ends thereof to the framelO byrneans of, the tie members 14 and constituting a. support for the lower tracks 12'. Extend1ng transversely of and journaled in suitable bracket bearings 15, secured upon opposite sides of theframe 10 adjacent the rear end description proceeds, espeever, as noted above, terial as well as the apparatus 18 utilized to thereof is j a shaft 16 carrying relatively large sprocket wheels 17 and 18. A second shaft 19 is mounted upon the frame jadja= cent the forward end thereof and carries the sprocket wheels 20 and 21 arranged in direct alignment with the sprockets 17 and 18." As shown the shaft 19 is journalecl in bearings 22 slidably mountedupon the ways 23 formed on thebrackets 24: which are secured on opposite sides of the frame 10. For

positively feeding the shaft 19 longitudinally 'of the frame a pair of screws 25 threadedly extend through the upright por-' tions 26 of the brackets .24 and engage the bearings 22. Thus it will be apparent that the longitudinal distance between theshafts 16 and 19 is variable enabling the device to be used as a conveyor or picking table.

The sand and gravel separating member comprises an endless screen cloth-27 divided into a plurality of uniform sections 20 which are secured to an endless bar link chain 29 carried by the sprockets. The pivots 30 for the links of the chain extend transversely of the screen and are provided upon the opposite ends thereof with the flange rollers 31 engageable with the'upper and lower'tracks 12 and 12. In order to provide a flexible screen so that the latter will conform to thecurvature of the sprockets every other strand of each section is losoped around the pivots 30 as indicated at In orderto insure a more efficient screening of the materials discharged upon: the screen the latter is vibrated. For accomplishing this result a vpluralityof longitudinally spaced blocks 32 are secured to the upper tracks 12. As shown, these blocks are inclined upwardly from the tracks in the direction of travel and are provided with a v substantially straight side 33. With suchan arrangement it is to be noted that the screen is efiicientlv vibrated irrespective of the load thereon, ing means. separate prime screen a serious disadvantage has been comviding a surplus of loaded. In" the present construction, how'- the, weight of the 'ma-' vibrate the screen and the use of a separate prime mover for this purpose is eliminated.

without the use of additional driv- In'prior sand machines using a I mover for vibrating the sprocket 37 mounted upon one end of the shaft 16.

The operation of the apparatus will no doubt be readily apparentfrom the foregoing description, it being understood that p the aggregate is discharged upon the screen at the lower end thereof and isconveyed upwardly by thescreen in the direction indicated by the arrow in Figure l and due to the vibration of thescreen as set forth above, the fines will drift through the mesh into a suitable by-pass chute 38 and bedischarged at the side between the screening surfaces. The oversize being carried upwardly bythe screen and discharged over the end thereof into any suitable container such for example a stone crusher.

Thus from the foregoing, it will be readily apparent that I have provided a. traveling grizzly screen inclined against the action of gravity and within the angle of friction so that the screen will not only function as a conveyor for elevating the rejected material to facilitate its handling but will more efficiently screen the material.

WhatI claim as my invention is:

1. In a machine for grading materials, a frame, tracks upon said frame, sprockets carried by said frame adjacent the opposite ends thereof, a bar link chain carried by said sprockets, the pivots for the links of said chain having rollers upon the oppositeends thereof engageable with said tracks, a screen carried by said chain and secured to the pivots aforesaid, and projections upon said tracks engageable with said rollers to vibrate said screen.

2. In a machine for grading materials, a

frame bent upwardly intermediate the ends thereof forming a platform, tracks upon said platform, sprockets journalled upon opposite sides of and adjacent the opposite ends of said frame, a bar link chain carried by the sprockets, the pivots forthe links of said chain having the opposite endsthereof projecting beyond the sprockets and provided with rollers engageable with said tracks, a screen comprising a plurality of sections having the opposite ends of each section looped around and secured to the pivots aforesaid, and means upon said tracks in the path of said rollers for vibrating said screen. I

3. In a machine for grading materials, the combination. Witha frame, of a chain movable relative to said frame, and a screen comprising a series of sections disposed betweenthe linksof said chain and having the end portions of certain strands encircling and connected to the link pivots of the chain. V v

4. In a machine for grading materials, the combination with a frame,"of a bar link chain carried by the frame, and a sectional screen having the strands thereof encircling the pivots for the chain intermediate the links thereof. 7

5. In a machine for grading materials, the combination of a screen comprising a series of sections having strands terminating in looped end portions,tand a chain'including a series of pivots "arranged to extend through the loops aforesaid for hingedly connecting adjacent sections of the screen.

6. In a machine for grading materials, the

combination of a sectional screen, alternate strands of adjacent sections of the screen terminating in looped portions, and a bar extending through the said looped portions for hingedly connecting the said sections.

7. Ina machine for grading material, the combination of a sectional screen, alternate strands of adjacent sections of said screen terminating in looped portions,and a bar link chain for actuating said screen having the pivots for the opposite links arranged to project through said loops for hingedly connecting the sections. 8. In a machine for grading materials, the combination with a frame having track portions, of a sectional screen carried by the frame, and a bar link chain having the pivots thereof extending transversely of the screen'and arranged to pivotally connect the loo sections thereof to form a continuous screen, 3

screen and arranged to pivotally conn'ec't'the sections of the latter to form a continuous screening surfacefthe pivots aforesaid being of sufiicient length to project beyond the opposite sides of the screen and engage the frame having spaced irregular surfaces uponthe tracks for vibrating the screen. 7

In testimony whereof I aflixmy signature. FREDERIC L. WARD; 

